New Features of Spatial-Temporal dynamics of Bloch Oscillations

A short laser pulse exciting semiconductor superlattice induces quantum beats between different excitonic states that in turn lead to a formation of a time-varying coherent wave packet. A real spatial oscillations of the excited wave packet identified quantum beats of the Wannier-Stark states as Bloch oscillations. Using a new technique for measurement of the spatial dynamics of Bloch wave packets in semiconductor superlattices we investigate the features of spatial-temporal dynamics on the initial experimental conditions and the composition of the wave packet.